Eaton@HI-MULTICS.ARPA (11/22/84)
Ron, the following diagram should allow you to connect the OSBORNE EXECUTIVE'S
IEEE-488 port to a CENTRONICS port:
IEEE-488 CENTRONICS
1 ------- DATA0 (LSB) -----> 2
2 ------- DATA1 -----------> 3
3 ------- DATA2 -----------> 4
4 ------- DATA3 -----------> 5
13 ------- DATA4 -----------> 6
14 ------- DATA5 -----------> 7
15 ------- DATA6 (MSB)------> 8
16 ------- DATA7 (PAR) -----> 9
6 ------- STROBE* ---------> 1
12 ------- GROUND ----------> 19
8 <------ BUSY ------------- 11
NOTE: STROBE IS NORMALLY NEGATIVE GOING PULSE.
BUSY LINE IS HIGH WHEN PRINTER IS BUSY. THERE ARE PULLUP
RESISTORS ON THE IEEE-488 WHICH PULL THIS LINE HIGH IF THE CABLE IS
UNPLUGGED OR IS WIRED INCORRECTLY.
GOOD LUCK AND LET ME KNOW HOW IT TURNS OUT. I STILL HAVE TO REWIRE MY CABLE
AS I TOO USED THE DIAGRAM ON PAGE 445 IN THE SYSTEM REFERENCE MANUAL. WE
"BOTH" KNOW THAT IS OUT TO LUNCH.
Jesse (all for better, more correctter documintasion) Eaton.HFED@HI-MULTICSRonald Blanford <CONTEXT@WASHINGTON.ARPA> (11/23/84)
The IEEE 488 to Centronics wiring diagram you gave works like a charm. There's still one minor problem unrelated to the wiring, and that's that the Executive's BIOS times out occasionally when the printer is busy and thinking that it's nonexistent asks if you want to deassign it. Answering "no" lets you continue just fine, but this is a nuisance because it occurs quite often with my slow letter-quality printer. The timeout delay should be patchable, but I haven't looked enough to find it yet. Thanks, Ron -------